Bolt-threading machine



S. B. CLAY.

BOLT THREADING MACHINE.

APPLICATION FILED OCT. 27, 1919'.

1,377,146. I Patented May3, 1921.

3 SHEETS-SHEET l- S. B. CLAY,

' BOLT ITHREADING MACHINE.

' APPLICATION :FILED OCT-:27, 1919. I 1,377,146. g Patented May 3, 1921.

3 SHEETS-SHEET 2.

z/ M Fwy 2m .9 A v E17 in: mun v Q w s. B. CLAY. I BOLT THREADINGMACHINE. APPLICATION FILED OCT-27, I919.

3 SHEETS-SHEET 3- m Vf/vrai Patntd May 3,1921.

SAMUEL B. CLAY, OF ST. LOUIS, MISSOURI, ASSIGNOR OF ONE-HALF TO EDWARDR.

FISH, OF WEBSTER GROVES, MISSOURI. it

BOLT-THREADING MACHINE.

Specification of Letters Patent.

Patented May a, 1921.

Application filed October 27, 1919. Serial No. 833,593.

To all whom it may concern:

Be it known that I, SAMUEL B. CLAY, a citizen of the United States,residing at St. Louis, Missouri, have invented a certain new and usefulImprovement in Bolt-Threadin Machines, of which the following is a fulficlear, and exact description, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to bolt and pipe threading machines.

One object of the invention is to provide a bolt or pipe threadingmachine which is equipped with means for automatically returning thecarriage to its starting position at the termination of the threadingopera tion.

Another object is to provide a bolt and pipe threading machine which isso con structed that the operator in charge of the machine merely has toturn a valve to cause the carriage to feed the bolt or pipe toward thethreading mechanism, the carriage being returned automatically to itsstarting position at the completion of the bolt threading operation.

To this end I have devised a bolt or pipe threading machine whichpreferably comprises a carriage operating means cons1sting of a pistonarranged 1n a cylinder to which an operating medium is supplied and twovalves for governing said operating me dium, one of said valves beingadapted to as is necessary with bolt and pipe threading machines of thekind now in general use, andl also make it possible for a girl tooperate the machine, due to the fact that no strength on the part of theoperator is required to. feed the carriage.

For the sake ofbrevity, I will hereinafter use the word bolt todesignate the work on which the machine operates, but I wish it to beunderstood that my invention is apphcable to any kind of threadingmachine in which the work, whether it be a bolt, p 1pe or other device,is mounted on a carriage whlch is so arranged with relation to thethreading mechanism that the work and the threading mechanism areseparated automatically at the termination of the threadmg operation bya' means operated by a fluid medlum such as a hydraulic medium,

steam, air, etc.

Eig. 5 is a side elevational view, illustrating a slight modification ofmy invention.

Referring to Fig. 1 of the drawings which illustrates the preferred formof my invention, A designates the base of a bolt threading machine, Bthe threading mechanism and C the carriage on which the bolt is mountedreparatory to the threading operation. he carriage C is preferablyprovided with a vise comprising a stationary jaw 1 and a movable jaw '2that is moved toward and away from said stationary jaw by means of apiston 3 arranged in a cylinder 4 that is mounted in any preferredmanner on the carriage C. In the form of my invention herein illustratedthe movable jaw 2 of the vise is arranged to slide horizontally and thecylinder 4 is arranged at one side of the carriage in longitudinalalinement with the movable jaw 2, as shown in Fi 2. Compressed air orany other suit ab e operating medium is supplied to the cylinder 4 bymeans of a valve D provided with an operating handle 5 arranged in sucha manner that it can be grasped easil by the operator standing at thefront of the machine. The casing of the valve Q is provided with asupply pipe 6, an exhaust pipe 7 and two pipes 8 and 9 that lead to theopposite ends of the cylinder 4, thereby permitting the jaw 2 of, thevise to be moved into clamping position by turning the han- .dle 5 inone direction and restored to its in- .operative position by moving saidhandle i the bolt threading mechanism B, said means comprising acylinder E provided with a piston 11 Whose rod 12 is connected to thecarriage C. The cylinder E can be mounted in any preferred manner, but Iprefer to support the head 13 of the cylinder on a horizontally-disposedshaft 14, as shown in Fig. 4, and connect the rod 12 of the piston to anarm 15 that projects downwardly from the carriage C, as shown in Fig.1.Com pressed air or any other suitable operating medium is admitted toand exhausted from the cylinder E by means of a manually-operatedthree-Way valve F arranged at the front end of the machine and adaptedto be turned by the operator in charge of the machine and anautomatically operated three-way valve F arranged at the rear end of themachine, as shown in Fig. 1. Means is provided for opening the valve Fautomatically when the carriage C reaches the end of its stroke in onedirection, namely, at the termination of the threading operation, andfor closing said valve when said-carriage reaches the end of its strokein the opposite direction, namely, when it reaches its startingposition. The mechanism herein illustrated for opening and closing thevalve F automatically consists of a rock arm or lever 16 that isconnected by means of a link 17 with an arm 18 on the stem of the valveF and a rod 19 connected to the carriageC and provided a with trippingdevices 20 and 21 that engage and movethe rock arm 16 at certain pointsinthe cycle of operations in the carriage C.

" When it is desired to feedthe .bolt to the threading mechanism theoperator turns the valve F so as to admit compressed air or any 'endofthe cylinder other suitable operatin medium to the front through thesupply pipe 22, thereby causing the carriage to move rearward toward thethreading on said carriage reaches ages the. rock arm 16 and moves it ina direction 'to cause the valve F to open at the termination of thethreadingoperation, thereby causing an operatin medium to enter the rearend of the'cylin er E through the supply pipe 22", andthus move thepiston 11 forwardly or in a direction to restore the carriage C to itss'tartingjposition. Just before the carriage C reaches the end of itsforward stroke the tripping device 21 on emme the rod 19 engages therock arm 16 and moves it in a direction to cause the valve F to closejust as the carriage reachesits starting position, the operating mediumthat was previously admitted to the cylinder E through the )ipe 22 beingallowed to escape from said cylinder when the valve F closes. Thetripping devices 20 and 21 are preferably adjustably mounted on the rod19 so as to enable the-operation of the carriage C to be accuratelycontrolled, said tripping devices being herein illustrated as beingmounted on a screw-threaded portion 19 of the rod 19 and held inadjusted position on said rod by means of a spring detent 20* on thetripping device 20 and a set screw 21 on the tripping device 21.

, \Vhile I prefer to equip the machine with a pneumatically-operatedmeans or a hydraulically-operated means for moving the carriagerearwardly toward the threading mechanism, I do not wish it to beunderstood that my invention is limited to a machine of suchconstruction, for if desired, a manuallyoperated means can be used formoving the carriage rearwardly toward the threading mechanism.Therefore, I have illustrated inrFig. 5 a machine of the same generalconstruction as the machine showniin Fig. 1, except that the means usedfor feeding the carriage C rearwardly consists of a powertermination ofthe threading operation.

2. A threading machine, comprising a threading mechanism, a carriage forholding the work, and means adapted 'to be operated by a fluid mediumfor causing the Work to be engaged by the threadingmechanism and forautomatically separating said work and threading mechanism at thetermination of the threading operation. V V 3. A threading machine,comprisin a threading mechanism, a carriage for hol ing the work, ameans adapted to be reciprocated in one direction by a fluid medium forcausmg the work to be engaged by. the

threading mechanism and in t direction to separate the work threadingmechanism, and a manually operable valve and an automatically-operatinvalve for governing the operation of sai means.

e opposite from the 4. A threading machine, comprisin a threadingmechanism, a carriage for fee ing the work to said threading mechanism,and means operated by a fluid medium for automatically returning saidcarriage to its starting' position at the termination of the.

threading operation.

' 5. A threading machine, comprising a threading mechanism, a carriagefor feeding the work to said threading mechanism, means adapted 'to beoperated by a fluid medium for returning the carriage to its startingposition, a valve for governing the medium for opening said valveautomatically at the termination of the threading operation and forclosing said valve automatically when the carriage is restored to itsstarting position.

7 A threading machine, comprising a.

threading mechanism, a carriage for feeding the work to said threadingmechanism, a cylinder provided with a piston for restoring said carriageto its starting position, a valve for governing the supply of a fluidmedium to and from said cylinder, and means carried by said carriage forcausing said valve to open when the carriage reaches the end of itsstroke in one direction and to close when said carriage reaches the endof its stroke in the opposite direction. Y

8. A threading machine,- comprising a threading mechanism, a carria efor feeding the work to said threading mec anism, a cylinder providedwith a piston that is connected to said carriage, a valve for governinthe supply of a fluid medium to said 'cy inder, an actuating mechanismfor said valve, and tripping devices carried by said carriage andarranged so as to engage said valve actuating mechanism and cause the Ivalve to open at the termination of the threading operationand to closewhen said carriage is restored to its starting position.

9. A threading machine, comprising a threading mechanism, a carriage forfeeding the work to said threading mechanism, a Work holder on saidcarriage provided with a movable member, means adapted to be operated bya fluid medium for actuating said movable member to clamp and. release.the work, and means adapted to be operated by a fluid medium forautomatically returning the carriage to its starting position at thetermination of the threading operation.

10. A threading machine, comprising a threading mechanism, a carriagethat feeds the work to said threading mechanism, means adapted to beoperated by a fluid medium for moving the carriage toward said threadingmechanism, and means for automatically returning said carriage to itsstarting position at the termination of the threading operation.

11. A threading machine, comprising a. threading mechanism, a carriagefor feeding the work .to said threading mechanism, means adapted to beoperated by a fluid medium for moving the carriage toward and away fromsaid threading mechanism, two valves for governing the medium thatoperates said means, and means for opening one of said valvesautomatically at the termination of the threading operation.

12. A. threading machine, comprising a. threading mechanism, a carriagefor feeding the work to said threading mechanism, a cyl- &

inder provided with a piston that is connected to said carriage, amanually-operable valve for admitting a fluid medium to one end of saidcylinder so as to move the earriage toward the threadin mechanism, asecond valve for admitting t efluid medium to the opposite end of saidcylinder, and means carried by the carriage to cause said second valveto openwhen the carriage reaches the end of its rearward stroke and toclose whensaid carriage reaches the end of its forward stroke.

